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Definition of silica : Silicon dioxide, SiO. It constitutes ordinary quartz ( also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder.

Synonyms:

silicon dioxide, silicon oxide

clay, calcite, lignite, manganese, talcum, chromite, bauxite, corundum, azurite, hornblende, kaolinite, ozocerite, asbestos, alabaster, fluorspar, fluorite, coke, silicate, selenite, emery, molybdenite, garnet, fool's gold, barite, salt, graphite, feldspar, quartz, iolite, aragonite, carbon, spar, mica, lazurite, peat, pyrite, pumice, pitchblende, gypsum, mineral, brookite, lime, obsidian, cryolite, chlorite, rhodonite, coal, diatomite, boron, brimstone, pyroxene, cobalt, orthoclase, glauconite, vermiculite, sulfur, chalcedony, crystal, quicklime, magnesite

Usage examples:

• He suggests that the Ventriculites of the chalk were nearly allied to these sponges, and that when the silica of their spicules was removed, and was dissolved out of the calcareous matrix, it set into flint. - "The Student's Elements of Geology", Sir Charles Lyell.
• The insoluble mineral matter is nearly all silica. - "A start in life", C. F. Dowsett.
• In a scientific museum I can stand before a glass case and see neatly labelled the exact portions of lime and silica and iron and water and other elements which compose my body. - "The Gospel of the Hereafter", J. Paterson-Smyth.